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> * Create a bitmap of pages that need vacuuming
>
>   Instead of sequentially scanning the entire table, have the background
>   writer or some other process record pages that have expired rows, then
>   VACUUM can look at just those pages rather than the entire table.  In
>   the event of a system crash, the bitmap would probably be invalidated.
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Bruce Momjian 2005-06-17 02:20:43 +00:00
parent a6c7e843da
commit 1b618e50a6
2 changed files with 15 additions and 2 deletions
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9
doc/TODO
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@ -2,7 +2,7 @@
PostgreSQL TODO List PostgreSQL TODO List
==================== ====================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Tue Jun 14 19:44:43 EDT 2005 Last updated: Thu Jun 16 22:20:43 EDT 2005
The most recent version of this document can be viewed at The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html. http://www.postgresql.org/docs/faqs.TODO.html.
@ -800,6 +800,13 @@ Vacuum
This allows vacuum to target specific pages for possible free space This allows vacuum to target specific pages for possible free space
without requiring a sequential scan. without requiring a sequential scan.
* Create a bitmap of pages that need vacuuming
Instead of sequentially scanning the entire table, have the background
writer or some other process record pages that have expired rows, then
VACUUM can look at just those pages rather than the entire table. In
the event of a system crash, the bitmap would probably be invalidated.
* Auto-vacuum * Auto-vacuum
o Move into the backend code o Move into the backend code
o Scan the buffer cache to find free space or use background writer o Scan the buffer cache to find free space or use background writer

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doc/src/FAQ/TODO.html
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@ -8,7 +8,7 @@
<body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF"> <body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF">
<h1><a name="section_1">PostgreSQL TODO List</a></h1> <h1><a name="section_1">PostgreSQL TODO List</a></h1>
<p>Current maintainer: Bruce Momjian (<a href="mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</a>)<br/> <p>Current maintainer: Bruce Momjian (<a href="mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</a>)<br/>
Last updated: Tue Jun 14 19:44:43 EDT 2005 Last updated: Thu Jun 16 22:20:43 EDT 2005
</p> </p>
<p>The most recent version of this document can be viewed at<br/> <p>The most recent version of this document can be viewed at<br/>
<a href="http://www.postgresql.org/docs/faqs.TODO.html">http://www.postgresql.org/docs/faqs.TODO.html</a>. <a href="http://www.postgresql.org/docs/faqs.TODO.html">http://www.postgresql.org/docs/faqs.TODO.html</a>.
@ -735,6 +735,12 @@ first.
</li><li>Maintain a map of recently-expired rows </li><li>Maintain a map of recently-expired rows
<p> This allows vacuum to target specific pages for possible free space <p> This allows vacuum to target specific pages for possible free space
without requiring a sequential scan. without requiring a sequential scan.
</p>
</li><li>Create a bitmap of pages that need vacuuming
<p> Instead of sequentially scanning the entire table, have the background
writer or some other process record pages that have expired rows, then
VACUUM can look at just those pages rather than the entire table. In
the event of a system crash, the bitmap would probably be invalidated.
</p> </p>
</li><li>Auto-vacuum </li><li>Auto-vacuum
<ul> <ul>